Just occurred to me. See those bridge spans across the Lake Pontchartrain and elsewhere that had been displaced or dislodged into the lake? They will have to be removed as shipping hazards and for many other reasons. Why not get some of those heavy lift floating cranes to salvage them and use them to shore up the leveee breaches. They look the ideal size, weight and dimensions. And they are available immediately. Sandbags just don't seem up to the job.